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In a row of (8) people, how many arrangements have (A) and (B) neither at the ends nor adjacent?

Answer and explanation

Correct answer: (14400)

For (A,B), use the (6) middle positions in (^{6}P_2) ways, then subtract adjacent cases (5\cdot 2\cdot 6!). Count middle-position and non-adjacent restrictions together.

Related tags

PermutationsSeatingRestricted PositionsPermutations And CombinationsMathematicsClass 11 Mcq

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